GB717597A - Electric discharge tube circuits - Google Patents

Abstract

717,597. Valve relay circuits. GENERAL ELECTRIC CO., Ltd., and BEESLEY, J. H. Nov. 11, 1952 [Jan. 4, 1952], No. 335/52. Class 40 (6) A switching circuit comprises a cold-cathode gas triode' tube which has a supply of positivegoing pulses applied to the anode so that the tube is fired by a triggering pulse applied to the striker electrode and is subsequently de-ionized by suppressing or reducing the amplitude of a number of the anode pulses. Fig. 1 shows a switching circuit in which the pulse train A, Fig. 2, is applied at A to the anode of gas triode W so that when a positive trigger pulse C, Fig. 2, is applied at point C tube W fires and remains conducting in between anode pulses. The tube is de-ionized by applying a negative pulse B, Fig. 2, at point B to cause gas-filled diode V to conduct and suppress one positive pulse at the anode D. The change in current through tube W may be used to operate a relay or the cathode current may be rectified and smoothed to produce an output at point X. In a modification shown in Fig. 3, trains of positive-going sequentially timed pulses are applied at A-D to the anode circuits of four cold-cathode gas triodes which are triggered by a positive trigger pulse applied at E which coincides with a pulse in a given input pulse train so that that train appears across the output G. Any triode may be de-ionized by a negative pulse applied at F or this pulse may be sufficiently long to de-ionize more than one tube. The circuits may be modified to operate with the triode anodes earthed and negative-going pulses supplied at the cathode and trigger electrodes.